Common Stock Warrant Liability - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended		3 Months Ended
	Jul. 31, 2011	Jun. 30, 2010	Mar. 31, 2014	Apr. 30, 2011
Class Of Warrant Or Right [Line Items]
Proceeds from issuance of warrants			$ 0.2
Warrant issued to purchase common stock		1.5
Aggregate purchase price of common stock warrant		$ 0.3
Common stock warrants expiration date			2020-06
Common stock warrants exercise price	$ 6.90	$ 10.30		$ 6.90
Warrant vested upon issuance			20.00%
Common stock warrants annual vesting percentage on each anniversary date			20.00%
Common stock warrants percentage vested			80.00%
Common stock issued as purchase consideration	0.3
Price per share of common stock issued	$ 6.64
Percentage of common stock warrants waiving protection provisions	79.30%
Warrant Exercise Price Reduced By Business Combination
Class Of Warrant Or Right [Line Items]
Common stock warrants exercise price	$ 6.64